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Note 1 - Summary of Significant Accounting Policies (Details Textual)
$ in Thousands, shares in Millions
 1 Months Ended 3 Months Ended 12 Months Ended 36 Months Ended
Apr. 30, 2018
USD ($)
Mar. 31, 2018
USD ($)
Dec. 31, 2019
USD ($)
shares
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2019
USD ($)
Jan. 01, 2019
USD ($)
Dec. 31, 2016
USD ($)
Number of Reportable Segments     4          
Accounts Receivable, after Allowance for Credit Loss, Current, Total     $ 167,825 $ 151,093   $ 167,825    
Accounts Receivable, Allowance for Credit Loss, Ending Balance     $ 1,944 $ 1,985 $ 1,456 1,944   $ 1,345
Finite-Lived Intangible Asset, Useful Life     10 years 240 days 11 years 240 days        
Insurance Policy Primary Occurence Limit     $ 1,000     1,000    
Workers Compensation Self Insurance Per Claim     1,300          
Cargo Losses Purchased Coverage per Claim     300          
Employee Annual Insuarnce Deductible Per Claim     $ 400          
Physical Damage Coverage     100.00%          
Drivers Advances And Other Receivables Net Of Allowance     $ 8,507 $ 16,675   8,507    
Liability for Claims and Claims Adjustment Expense, Single Loss Limit $ 9,000              
Liability for Claims and Claims Adjustment Expense, Aggregate Limit per Policy Year 18,000              
Liability for Claims and Claims Adjustment Expense, Aggregate Three Year Limit 30,000              
Auto Policy Release Premium Refund 14,000              
Interest Costs Capitalized     $ 100 100 $ 100      
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount | shares     0.2          
Operating Lease, Liability, Total     $ 60,342     60,342    
Operating Lease, Liability, Current     19,460   19,460    
Operating Lease, Liability, Noncurrent     $ 40,882   $ 40,882    
Accounting Standards Update 2014-09 [Member]                
Cumulative Effect on Retained Earnings, Net of Tax, Total   $ 600            
Accounting Standards Update 2016-02 [Member]                
Operating Lease, Right-of-Use Asset             $ 40,100  
Operating Lease, Liability, Total             41,000  
Operating Lease, Liability, Current             15,300  
Operating Lease, Liability, Noncurrent             $ 25,700  
Tractors [Member]                
Property, Plant and Equipment, Useful Life     5 years          
Property, Plant and Equipment, Salvage Value, Percentage     15.00%     15.00%    
Refrigerated Trailers [Member]                
Property, Plant and Equipment, Useful Life     7 years          
Property, Plant and Equipment, Salvage Value, Percentage     25.00%     25.00%    
Dry Van Trailers [Member]                
Property, Plant and Equipment, Useful Life     10 years          
Property, Plant and Equipment, Salvage Value, Percentage     25.00%     25.00%    
Collateral for Collection Issues [Member]                
Accounts Payable, Total     $ 1,800     $ 1,800    
Minimum [Member]                
Cash Advance For Factoring Receivables Percentage     85.00%          
Finite-Lived Intangible Asset, Useful Life     5 years          
Auto Policy Release Premium Refund 0              
Minimum [Member] | Revenue Equipment [Member]                
Property, Plant and Equipment, Useful Life     3 years          
Capital Leases of Lessee, Term of Contract     4 years          
Maximum [Member]                
Cash Advance For Factoring Receivables Percentage     95.00%          
Finite-Lived Intangible Asset, Useful Life     15 years          
Auto Policy Release Premium Refund $ 5,200              
Maximum [Member] | Revenue Equipment [Member]                
Property, Plant and Equipment, Useful Life     10 years          
Capital Leases of Lessee, Term of Contract     7 years          
Factoring Receivables [Member]                
Accounts Receivable, after Allowance for Credit Loss, Current, Total     $ 86,600 53,600   86,600    
Accounts Receivable, Allowance for Credit Loss, Ending Balance     500 400   500    
Receivables from Insurers [Member]                
Drivers Advances And Other Receivables Net Of Allowance     300 3,000   300    
Self Insurance [Member]                
Other Assets, Total     $ 2,100 $ 5,100   $ 2,100    
Customer Concentration Risk [Member] | Revenue Benchmark [Member]                
Number of Major Customers     1 1 2 10    
Concentration Risk, Percentage     45.00% 49.00% 49.00%      
Transport Enterprise Leasing LLC [Member]                
Equity Method Investment, Ownership Percentage     49.00% 49.00%   49.00%